Monthly means of measured daily radiation data from a defined horizontal site are used to estimate the prevailing atmospheric attenuation parameter. The estimation method uses the properties of the Fourier structure of attenuation, as a function of the hour angle, at that site, for a range of attenuation parameters. The Fourier structure of the parameter estimate is then used to calculate the global daily radiation of a "nearby" site, of any orientation, by direct formula substitution.
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K. J. A. Revfeim (1978) studied this question.
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